LeetCode 2749: Minimum Operations to Make the Integer Zero Solution

Master LeetCode problem 2749 (Minimum Operations to Make the Integer Zero), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2749. Minimum Operations to Make the Integer Zero

Medium

Bit Manipulation Brainteaser Enumeration

Problem Explanation

Explanation

To solve this problem, we can iterate through all possible values of i in the range [0, 60] and calculate the result of subtracting 2^i + num2 from num1. We keep track of the minimum number of operations needed to make num1 equal to 0. If it is not possible to make num1 equal to 0, we return -1.

Algorithm:
1. Initialize a variable operations to keep track of the minimum number of operations needed.
2. Iterate through all possible values of i from 0 to 60.
3. Calculate the result of subtracting 2^i + num2 from num1.
4. If the result is 0, update operations to the current number of operations.
5. Return the minimum number of operations if it is not equal to Integer.MAX_VALUE, otherwise return -1.
Time Complexity: O(1) as we are iterating through a constant range [0, 60].
Space Complexity: O(1) as we are using constant extra space.

Solution Code

class Solution {
    public int minOperations(int num1, int num2) {
        int operations = Integer.MAX_VALUE;
        
        for (int i = 0; i <= 60; i++) {
            long curr = (long) num1 - (1L << i) * num2;
            if (curr == 0) {
                operations = Math.min(operations, i + 1);
            }
        }
        
        return (operations != Integer.MAX_VALUE) ? operations : -1;
    }
}

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